On a project that references the Microsoft.VSSDK.BuildTools
package, enables installing extra VSIXes to the targetted Visual Studio
version and instance by simply declaring them as @(Vsix) items:
<ItemGroup>
<Vsix Include="MyOtherExtension.vsix" />
</ItemGroup>
The items will be installed only...
More information

After adding this NuGet package to your Visual Studio Package project the build process will be updated
and the .vsix file created will be compressed. The % of compression varies from project to project, but its common
to see results from 40-70%. By having a smaller .vsix file when users...
More information